On Wed, Nov 15, 2017 at 12:33 AM, Robert Haas <robertmh...@gmail.com> wrote: > On Sun, Sep 10, 2017 at 5:29 AM, Dmitry Dolgov <9erthali...@gmail.com> wrote: >> average latency: >> >> clients patch master >> 10 0.321 0.286 >> 20 0.669 0.602 >> 30 1.016 0.942 >> 40 1.358 1.280 >> 50 1.727 1.637 > > That's still a noticeable slowdown, though. And we've had previous > reports of the overhead of logging being significant as well: > > http://postgr.es/m/caclsapsa7u0gcfpojvqem6sgtekv8vnwdbfhvi+dqo+gu5g...@mail.gmail.com > > I seem to recall a discussion, perhaps in-person, around the time Theo > submitted that patch where it was reported that the logging collector > could not be used on some systems he was working with because it > became a major performance bottleneck. With each backend writing its > own messages to a file, it was tolerable, but when you tried to funnel > everything through a single process, the back-pressure slowed down the > entire system unacceptably.
I have moved this patch to next CF for now.. The original patch still applies. -- Michael
